Login to your 1and1 admin account.
Select your package and go into the administration area.
Click the “Applications” link
Find the MySQL link and click it.
It should now list the following for the users:
Database Name User Name Password Host Name
And right below that, show the database stats (size and all that).
If both areas are blank, then there’s no database.
It’s possible that it shows a database (in the second grid) and nothing in the first. That means there’s no users created.
Either of those missing could be the problem. If so, simply run through the setup for eith or both as needed.
Once done, wait an hour or two, to give the system a chance to finish processing everything, then set your wp-config.php settings according to the data in that first grid, and you should be OK.
Tg